Since I see a lot of people commenting on this topic, I would like to offer a different perspective.
Pope JPII was for my southern European social democratic Catholic family much more polarizing than Pope Francis. Pope Francis had politics that are mainstream and not at all controversial in my part of the world. Whereas JPII was perceived as the guy who was buddies with Reagan and Bush and a general supporter of American foreign policy. To what extent that was a fair assessment, I do not want to comment, since he did try to speak against the invasion of Iraq.
None the less, it is not true that Pope Francis is more popular with non-Catholics (Reagan, Bush and most of the US were not Catholic and big supporters of JPII). It was also JPII that started the interfaith dialogue. It is also not true that Pope Francis is unpopular with Catholics.
There are Catholics all across the globe with vastly different opinions on all kinds of issues.